Beat-up mechanism of looms for weaving



Aug. 19, 1941. D. w. SHIMWELL BEATUP MECHANISM OF- LOOMS FOR WEAVING Filed Jan. 23, 1941 3 Sheets-Sheet l 1941- D. w. 'SHIMWELL 2,253,097

BEAT'UP MECHANISM OF LOOMS FOR WEAVING Filed Jan. 23, 1941 3" Sheets-Sheet 2 W dz'Wh/sJ/ 1941f D. w. SHIMWELL 2,253,097

BEAT-UP MECHANISM OF LOOMS FOR WEAVING Filed Jan. 23, 1941 3 Sheets-Sheet 3 uea ig :2. W UV) z' nh d/ Patented Aug. 19, 1941 BEAT-UP MECHANISM OF LOOMS FOR WEAVING Derrick Walter Shimwell, Shiplake-on-Thames, England Application January 23, 1941, Serial No. 375,661 In Great Britain January 9, 1940 Claims.

This invention relates to the beat-up mechanism of looms for weaving, such mechanism being of the type in which the reed and shuttle boxes move together during the time that the shuttle is travelling through the reed space, after which the shuttle boxes come to rest whilst the reed moves forward for a further distance to effect beating up; the reed then returns and overtakes the shuttle boxes with which it moves in line backwards to the initial position during the flight of the shuttle through the reed space. Beat-up mechanism of the aforesaid type is described and claimed in U. S. Patent No. 2,159,865.

The object of the present invention is to provide a mechanism for operating the reed and shuttle boxes which can be produced economically, which is reliable in operation and which obviates the use of cams or cam slides. A further object of the invention is to provide a mechanism such as aforesaid which allows a very long period of the loom cycle for the shuttle to pass through the warp shed and also facilitates the passage of the shuttle into and out of the shuttle boxes.

In accordance with this invention, both the reed and the shuttle boxes are operated from cranks on a common shaft, the cranks driving the reed and race having a larger throw than the ones driving the boxes, and the crank arms driving the reed and race being shorter than the crank arms that drive the shuttle boxes. Due to the larger throw and the shorter crank arms that operate the reed and race, and the shorter throw and the longer crank arms that operate the boxes, when these parts are of correct relative proportions, the reed and race have a somewhat similar movement to that of the shuttle boxes for about 220 of the loom cycle.

In order to give the additional extent of forward movement to the reed and race to effect beat-up, the motion of each crank arm which actuates the reed, and race is preferably transmitted to the latter through a lever pivoted at its lower end to a shuttle box sword, the upper end being coupled by a suitable connecting rod to the: reed and race. Whilst the shuttle boxes and reed and race move in unison, the said levers.

do not have any effect on the movement of the reed and race but when the shuttle boxes com mence to slow down,the lower ended the said by pin and slot or other means to vary the timing 1 of the reed and race motion relatively to that of the shuttle boxes.

There are rearward extensions or brackets upon the shuttle box swords to which the crank arms of the cranks driving the shuttle boxes are attached.

The reed and race arecarried by auxiliary swords pivotally attached to the shuttle box swords.

I pivot the shuttle box backs to the shuttle boxes towards the outer ends of the latter and cause a spring to hold each back in its closed position against the sole plate. The inside end of each box back has an extension arm attached to it and after the beat-up, when the reed overtakes the boxes, the beat-up mechanism moves this extended arm and presses the back backwards in alignment with the reed, keeping it always in such alignment whilst the reed and race travel past the original line of the boxes. The box backs are held in alignment with the reed until the shuttle has entered the shuttle box on the opposite side, when the pressure is released from the box backs as the reed and race go forward to beat-up, leaving the box backs in their original position pressed against the sole plate by means of the spring.

Reference will now be had by way of example to the accompanying drawings, in which- Figures 1 and 2 are side sectional elevations showing the mechanism at one end of the loom for moving the shuttle boxes and reed, in two different positions,

Figure 3 is a plan viewof the said mechanism, and

Figures 4 and 5 are sectional plan views of a modified construction of one of the shuttle boxes, with some of the associated parts.

The reed is shown at a, the race at b and the shuttle box at c. The shuttle is seen at d. Each shuttle-box is mounted on a sword e to. which is pivoted an auxiliary sword I carrying the reed and race.

There is a rotary crank shaft 9 upon which are two cranks h and i, lying in the same plane, the

former of which has a smaller throw than the latter. These are seen most clearly in Figure 3. There is a bracket 7' at the rear of the sword e and to this is pivoted a crank arm it upon the crank which thereby reciprocates the shuttle box.

The reed sword I is reoiprocated by the crank 2 through the crank arm m, which is shorter than the crank arm is. The crank arm m is not directly connected to the sword I but is pivoted to the centre part of a bent lever n which is pivoted at its lower end at o (if desired in an adjustable manner) to the bracket 7 and at its upper end is connected to the sword f through a toggle linkage p, to one end of which it is pivoted at m. If the shuttle fails to be boxed properly, the

swell q causes the arm 1' to be moved to a position in which its end engages the frog s as the shuttle boxes move forward, causing the collapse of the toggle linkage p, as shown in Figure 2, and thereby preventing the reed moving ahead of the shuttle boxes in the normal manner to effect beat-up and possibly injuring the warp threads, and also stopping the loom, as more fully described in Specification No. 2,159,865 above mentioned.

In the normal way, however, when the shuttle does not fail to be properly boxed, the toggle linkage 10 remains rigid and transmits the motion from the larger throw crank i, shorter crank arm m and lever n to the reed-carrying the auxiliary sword I. Due to the difference in throws of the cranks h and i and in lengths of the crank arms k and m, the reed and race have a somewhat similar movement to that of the shuttle boxes for about 220 of the loom cycle, during which the flight of the shuttle takes place. When the shuttle has been boxed, however, the shuttle boxes commence to slow down and the pivot point of the. lever n likewise slows down, resulting in a forward movement of the upper end of the said lever which therefore through the toggle linkage p moves the reed quickly forward to effect beat-up.

Figures 4 and show a construction of shuttle box for the purpose of ensuring smooth passage of the shuttle into and out of the shuttle boxes. It will be seen that the back t of the shuttle box is pivoted to the shuttle box at M, (which is also the pivot point for the swell q) near the outer end thereof, and at its inner end has a bent extension arm 12 which passes behind the shuttle box sword e and is constrained forwards towards such sword by the spring 11; mounted upon the latter. Thus the shuttle box back is normally kept pressed forward until it just touches the sole plate of the shuttle box, as shown in Figure 4, its forward movement being limited by the lock nuts -w V The pivot pin a connecting the lever n to the toggle linkage p has (in this construction) an extension through which passes freely (with pivotal play in a vertical plane) a rod 1 This rod passes freely through the extension arm '0 upon the shuttle box back and has a certain amount of lost motion limited by the nuts 2, which after setting in the desired position are pinned to the rod.

The effect of this construction is that the reed can move forward in advance of the shuttle boxes to effect beat-up, the pivot .r sliding freely along the rod 1 and the shuttle box back 25 remaining in'its Figure 4 position. On the return stroke of the reed, however, once this has overtaken the shuttle boxes, and the shuttle has commenced its flight, the pivot a: through the rod y and end nut .2 draws the shuttle box back 13 slightly rearfl together until the shuttle has been boxed in the other shuttle box, after which the box back will be returned by its associated spring w to its Figure 4 position. This ensures easy entry of the shuttle both into the reed space and the shuttle boxes. The shuttle leaves a closed box and enters an open one.

With my improvement, I obtain a long dwell around back centre when the crank arms are passing into and out of alignment with the cranks, with a rapid advance of the reed and race when the shuttleboxes are coming to rest, thus giving a very long period of the loomcycle for the shuttle to travel through the warp shed.

What I claim is:

1. Beat-up mechanism of the type described for a loom for weaving, in which both the-reed and the shuttle boxes are operated from cranks on a common shaft, the cranks driving the reed. and race having a larger throw than the ones driving the shuttle boxes, and the crank arms driving the reed and race being shorter than the crank arms that drive the shuttle boxes, the relative proportions of these cranks and crank arms being such that the reed and race have a somewhat similar movement to that of the shuttle boxes for about 220 of the loom cycle.

2. Beat-up mechanism as claimed in claim 1, in which the motion of each crank arm which actuates the reed and race is transmitted'to the latter through a lever pivoted at its lower end to a shuttle box sword, the upper end of said lever being coupled by a suitable connecting rod to the reed and race, whereby the movement of the reed and race quickly forward to effect beat-up is caused when the shuttle boxes commence to slow down.

3. Beat-up mechanism as claimed in claim 1, in which the motion of each crank arm which actuates the reed and race is transmitted to the latter through a lever pivoted at its lower end to a shuttle box sword, the upper end of said lever being coupled by a suitable connecting rod to the reed and race, whereby the movement of the reed and race quickly forward to effect beatup is caused when the shuttle boxes commence to slow down, the connecting rod being constituted by a toggle linkage which is automatically collapsed if the shuttle fails to be properly boxed.

4. Beat-up mechanism as claimed in claim 1, in which the shuttle box back is pivoted for rearward motion, spring impelled forward and drawn back automatically by the reed moving mechanism when the reed overtakes the shuttle boxes after beat-up, whereby the said shuttle box back is maintained in alignment with the reedduring the flight of the shuttle through the shed.

5. Beat-up mechanism as claimed in claim 1, in which-the shuttle box back is pivoted for rearward motion,' spring impelled forward and-drawn back automatically by the reed moving mechanism when the reed overtakes the shuttle Lbokes after beat-up, whereby the said shuttle box back is maintained in alignment with the reed during the flight of the shuttle through the shed, the drawing back of the shuttle box back being'effected by a rod which passes freely but'with limited lost motion through an extension upon the shuttle box back and through a pivot pin in the reed moving mechanism. 

